As the tooling used to make Amal carbs is pretty much all completely worn out, I wonder why there is any great concern over tolerances? For anyone looking to do a top class restoration, its far better to try and find a pair of NOS Amal carbs from as long back as possible, as these are going to be far better than the ones being sold today, simply due to the tooling being less badly worn.

Carbonfibre wrote:As the tooling used to make Amal carbs is pretty much all completely worn out

Source of this information?

If you ask Amal they say;

“Since we acquired Amal in 2003 we have been working continually to replace the inherited tooling and improve the quality of the carburetters. New tooling for the 900 Series carburetters was introduced in 2008. New tooling for 376 and 389 Monoblocs has been introduced this year. New tooling for the 600 Series Concentrics, 2900 Series Mark 2 carburettors and 375 Monoblocs is currently being made and we are waiting to see the first samples produced from it. The 375 carburetter has not been available since the 1960s. Hopefully the new carburetters will be available later this year. 2000 Series Mark 2 tooling will follow shortly.

With the use of modern CNC machinery all tolerances have been tightened up where possible on the original limits, except where they are fundamental to the performance of the carburetter.

At the same time we have an ongoing programme of development of the carburetters which has resulted in products such as the new floats and slides and the re-introduction of many Amal parts that have not been available for years. The 900 Series castings are now passivated, a form of anodising which improves resistance to wear which can be recognised by the slight “oily” sheen to the metal when new. A further modification for 900 Series carburetters is imminent which improves idle circuit metering and access."

If thats the case it seems strange that NOS Amal carbs seem so much better than those produced currently?

Carbonfibre wrote:If thats the case it seems strange that NOS Amal carbs seem so much better than those produced currently?

I assume you have both in your hands to compare?

Have had ................but how quickly the recently made Amals wear out in comparison to OE ones, tells you a great deal!

Carbonfibre wrote:Have had ................but how quickly the recently made Amals wear out in comparison to OE ones, tells you a great deal!

If one was buying new Amals, wouldn't it make sense to go the extra yard and get chromed brass slides, and thereby extend the service life of the new carbs in comparison with OEs?

Carbonfibre wrote: tells you a great deal!

Like what? Are they made of different zinc, or do they start out with a bigger clearance?


And please just answer what you've been asked, in brief factual terms.